JPH067514B2 - Discharge lamp circuit abnormal condition detection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ballast of a discharge lamp circuit and a discharge lamp circuit abnormal state detection device capable of easily recognizing an abnormal state based on the life of a discharge lamp.

[Conventional technology]

It is generally said that the discharge lamp has a life of 6000 to 12000 hours and the ballast has a life of 40,000 hours. These lifespans are mainly caused by discharge inability in the case of a discharge lamp due to a decrease in the starting ability thereof and a layer short circuit due to insulation deterioration in the case of a ballast.

Usually, the lighting circuit is configured to control the lighting of 6 to 12 discharge lamp circuits simultaneously on the same line. Therefore, if one of these lights cannot discharge and is in a faulty state,
Or if a layer short circuit occurs in one ballast,
It is not possible to identify at a glance which discharge lamp circuit the astigmatism discharge lamp or layer short ballast belongs to, but if a layer short circuit occurs in the ballast,
Since the common line that supplies power to multiple discharge lamp circuits is cut off by the breaker, other normal discharge lamp circuits connected to that line will also be cut off at the same time. there were.

As a means for solving these problems, a discharge lamp circuit abnormal state detecting device having a configuration as shown in FIG. 3 has been conventionally proposed. That is, the detection device includes an AC power source 21 and a ballast.
In a discharge lamp circuit including a discharge lamp 22 and a discharge lamp 23, a ballast life detection circuit 24 is arranged between the power supply 21 and the ballast 22 to detect an overcurrent due to a layer short circuit during the life of the ballast.
The fuse 25 placed in 24 cuts off the voltage, and after the cutoff, the no-voltage state between the input terminals XY of the ballast 22 is detected by the no-voltage state detection unit 26 arranged in the ballast life detection circuit 24, Similarly, the LED connected to the DC source 27 in the detection circuit 24
The indicator lamp 28 such as the above is made to emit light so that the life of the ballast 22 can be detected and the influence on other discharge lamp circuits can be prevented.

[Problems to be solved by the invention]

However, the above-mentioned detection means cannot display the faulty state of the discharge lamp, so that there is a drawback in that the maintenance and inspection work efficiency is halved.

In order to remedy this drawback, as shown in FIG. 4, a choke coil 29 of a ballast 22 is provided with a secondary winding 30 for stepping down the impedance voltage, an indicator lamp 31 is connected, and the indicator lamp 31 is turned on. There has been proposed a device that displays the state of a faulty electric light. However, in this means, when the discharge lamp is normally lit, the indicator lamp 31 is always lit to perform the normal lighting display of the discharge lamp, which is not only uneconomical, but also as a display lamp more than the life of the discharge lamp. It is necessary to use a lamp having a lamp life that is twice as long, and there is a problem that a choke coil having a special structure provided with a secondary winding is required.

The present invention has been made to solve the above-mentioned problems of the conventional discharge lamp circuit abnormal state detection device, and it is possible to easily and economically determine which discharge lamp or ballast has a long life, and a specific stability. It is an object of the present invention to provide a discharge lamp circuit abnormal state detection device configured so as not to affect other discharge lamp circuits connected to the same line due to the life of the device.

[Means and Actions for Solving Problems]

In order to solve the above problems, the present invention provides a discharge lamp circuit including a ballast and a discharge lamp connected to an AC power source via a fuse, and a power supply connected to an input side of the ballast to detect a power supply voltage. A voltage detection circuit and a no-voltage detection signal when the fuse of the power supply voltage detection circuit is blown, and a life indicator lamp for continuous lighting, and a voltage between the discharge lamp terminals connected to the output side of the ballast are detected. Abnormal state of the discharge lamp circuit by the load voltage detection circuit and the oscillation circuit for intermittent lighting of the life indicating lamp that starts oscillation by the detection signal of the no-load voltage state of the load voltage detection circuit when the discharge lamp is not lit It constitutes a detection device.

With this configuration, it is possible to easily and economically determine which of the discharge lamps or ballasts has reached the end of its life in a large number of discharge lamp circuits. It is possible to prevent the discharge lamp circuit from being affected.

〔Example〕

Examples will be described below. FIG. 1 is a diagram showing an embodiment of a discharge lamp circuit abnormal state detecting device according to the present invention.
In the figure, 1 is an AC power supply, and both terminals A and B of the power supply 1
In between, a choke coil type ballast 3 via a fuse 2
And a discharge lamp circuit 4 including a discharge lamp 4 such as a metal vapor discharge lamp. 5 is a DC source connected to the AC power source 1, and 6 is a life indicating lamp consisting of an LED or the like, which continuously emits light during the life of the ballast and blinks during the life of the discharge lamp to indicate which life it is. To do.

Q ₁ is a transistor for driving the life indicator lamp 6, R
₁ is a current limiting resistance of the life indicating lamp 6, R ₂ is a base current limiting resistance of the transistor Q ₁ , and 7 is a fuse 2
A power supply voltage detection circuit for detecting that the voltage between the connection point C between the and choke coil type ballast 3 and one terminal B of the AC power supply is in a no-voltage state, R ₃ , R ₄ Is a voltage dividing resistor for setting the input voltage to the power supply voltage detection circuit 7.

8 is an oscillator circuit which intermittently outputs an ON signal, R ₅ and C ₁
Are resistors and capacitors for setting the cycle of the output signal of the oscillation circuit 8. Q ₂ is a switching transistor that controls the operation of the oscillation circuit 8, R ₆ is a resistance for preventing overcurrent when the transistor Q ₂ is ON, R ₇ is a base resistance of the transistor Q ₂ , and 9 is a terminal between the discharge lamps 4. Load voltage detection circuits for detecting the voltage of R ₈ and R ₉ are voltage dividing resistors for setting the input voltage to the load voltage detection circuit 9. D is a diode, which has a function of sending an intermittent ON signal from the oscillation circuit 8 to the base of the transistor Q ₁ . Note that, in FIG. 1, the parallel capacitor for achieving a high power factor is omitted.

Next, the operation of the discharge lamp circuit abnormal state detecting device configured as described above will be described. First, the AC power supply 1 is turned, between the dividing resistors R _3, R ₄ and between R _8, R _9, is substantially the same AC power supply voltage is applied.

Next, when the discharge lamp 4 starts lighting, the voltage dividing resistors R ₈ and R
The voltage across ₉ rises from zero to the lamp voltage of the discharge lamp 4 over time.

In such a normal lighting state of the discharge lamp, since the power supply voltage is applied between the voltage dividing resistors R ₃ and R ₄ on the input side of the choke coil type ballast ₃ , the voltage dividing resistor R ₃ is applied. ₃ ,
The AC voltage divided by the voltage division ratio of R ₄ is input to the power supply voltage detection circuit 7, and the internal transistor forming the circuit 7 is turned on and the output of the circuit 7 is turned off. The transistor Q ₁ is turned off, and the life indicator lamp 6 is in a state of not emitting light.

Further, the voltage between the terminals of the discharge lamp 4 changes from zero to a lamp voltage (for example, 130 V), but the voltage between the terminals is the power supply voltage.
If the output voltage of the load voltage detection circuit 9 does not turn off unless the voltage exceeds 90% (180V) of (200V), the voltage dividing resistor R
If the voltage division ratio of ₈ and R ₉ is set, the transistor Q ₂ is ON in a normal discharge lamp lighting state. Therefore, the DC voltage supplied to the oscillation circuit 8 is short-circuited, and the oscillation operation of the oscillation circuit 8 is stopped. Therefore, in the normal lighting state of the discharge lamp, the intermittent signal is not applied to the base of the transistor Q ₁ and the life indicator lamp 6 does not blink.

Next, if the discharge lamp has reached the end of its life and cannot be discharged, the voltage between the discharge lamp terminals rises to the power supply voltage. Due to this increase in the load voltage, the internal transistor forming the load voltage detection circuit 9 is turned on and the output of the circuit 9 is turned off. As a result, the transistor Q ₂ is turned off and a direct current voltage from the direct current generation source 5 is applied to the oscillation circuit 8, and an intermittent signal is generated at an oscillation cycle (for example, 2 seconds) determined by R ₅ and C ₁ which form a time constant circuit. Is output. Since this intermittent output signal is sent to the base of the transistor Q ₁ via the diode D, the transistor Q ₁ is turned on at its oscillation cycle, for example, at an interval of 2 seconds.
The life display lamp 6 is blinked by repeating N and OFF. That is, when the discharge lamp is defective, the life display lamp 6 blinks to indicate that it is in a defective state.

Furthermore, when the ballast 3 reaches the end of its life and a layer short circuit occurs, the fuse 2 is blown by an overcurrent. Due to the melting of the fuse 2, both the input side and the output side of the choke coil type ballast 3 are in a non-voltage state. Input side of the ballast 3, i.e. dividing resistors R _3, R ₄ between is no voltage, the power supply voltage output becomes ON detection circuit 7, whereby the transistor Q ₁ is turned ON life display lamp 6 is continuous emission state Becomes At this time, there is no voltage between the voltage dividing resistors R ₈ and R _9, that is, between the discharge lamp terminals, but the input state to the load voltage detection circuit 9 in this case is the same as when starting the discharge lamp during normal lighting. As a result, the output of the detection circuit 9 is turned on, the oscillator 8 does not operate and does not generate an output signal, and therefore the intermittent signal is not supplied to the base of the transistor Q ₁ via the diode D. Therefore, during the life of the ballast 3, the life indicator lamp 6 maintains a continuous light emission state by the operation of only the power supply voltage detection circuit 7.

FIG. 2A is a schematic block diagram showing another embodiment of the present invention. In this embodiment, the present invention is applied to a discharge lamp lighting circuit using a magnetic leakage transformer, and 11 is the same as the embodiment shown in FIG.
The discharge lamp and ballast life detection circuit, which consist of a power supply voltage detection circuit, an oscillation circuit, a load voltage detection circuit, etc., detect the voltage on the input side and output side of the magnetic leakage transformer 12, and the life indication lamp continuously Alternatively, a blinking display is performed to display the life of the ballast including the magnetic leakage transformer 12 or the life of the discharge lamp 4.

FIG. 2 (B) is a schematic block diagram showing still another embodiment of the present invention. In this embodiment, the present invention is applied to a constant power type discharge lamp lighting circuit using a magnetic leakage transformer 13 and a series capacitor 14, and 15 is a direct current source similar to the embodiment shown in FIG. , Life display lamp, power supply voltage detection circuit,
With a discharge lamp and ballast life detection circuit composed of an oscillation circuit, a load voltage detection circuit, etc., the voltage on the input side of the magnetic leakage transformer 13 and the voltage between the discharge lamp terminals are detected via the transformer 15a, The life display lamp is configured to perform continuous or blinking display to display the life of the ballast including the magnetic leakage transformer 13 or the life of the discharge lamp 4. Also, these embodiments can exhibit the same effects as the embodiment shown in FIG.

〔The invention's effect〕

As described above based on the embodiment, according to the present invention, the life indicator lamp blinks or lights continuously only when the discharge lamp circuit is abnormal, and displays the fault condition of the discharge lamp or the life of the ballast, Since the life indicator lamp does not emit light during normal lighting, it is possible to clearly identify the discharge lamp or the ballast that has reached the end of its life, which is economical and not annoying. Even if the discharge lamp circuit is installed at a remote location such as a high place, only the discharge lamp circuit that is in an abnormal state due to its life is displayed as a light emission, making it easy to distinguish it from other normal discharge lamp circuits. Moreover, there is an advantage that the other fuses are not affected by the melting of the built-in fuse.

Further, since a conventional ballast can be used as it is without requiring a ballast having a special structure, it can be economically and easily applied to an existing discharge lamp circuit.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a discharge lamp circuit abnormal state detecting device according to the present invention, and FIGS. 2 (A) and 2 (B) are schematic block configuration diagrams showing other embodiments of the present invention. 3 and 4 are views showing a conventional discharge lamp circuit abnormal state detecting device, respectively. In the figure, 1 is an AC power supply, 2 is a fuse, 3 is a choke coil type ballast, 4 is a discharge lamp, 5 is a DC generation source, 6 is a life display lamp, 7 is a power supply voltage detection circuit, 8 is an oscillation circuit, 9 Indicates a load voltage detection circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-13993 (JP, A) JP-A-62-195898 (JP, A) Actually open Sho-62-31399 (JP, U) Actual-open Sho-60- 3699 (JP, U)

Claims (1)

[Claims] 1. A discharge lamp circuit comprising a ballast and a discharge lamp connected to an AC power source via a fuse, a power supply voltage detection circuit connected to an input side of the ballast and detecting a power supply voltage, and the power supply. With a detection signal of a no-voltage state when the fuse of the voltage detection circuit is blown, a life display lamp for continuously lighting and a load voltage detection circuit connected to the output side of the ballast to detect the voltage between the discharge lamp terminals, Discharge lamp circuit abnormality, comprising: an oscillation circuit for intermittent lighting of the life indicator lamp, which starts oscillation by a detection signal of a no-load voltage state of the load voltage detection circuit when the discharge lamp is not lit. State detection device.